<template>
  <div class="pagination">
    <ul>
      <li :class="{'disabled': current == 1}"><a href="javascript:;" @click="setCurrent(current - 1)"> « </a></li>
      <!-- <li :class="{'disabled': current == 1}"><a href="javascript:;" @click="setCurrent(1)"> 首页 </a></li> -->
      <li v-for="p in grouplist" :class="{'active': current == p.val}" :key="p.val"><a href="javascript:;"
                                                                          @click="setCurrent(p.val)"> {{ p.text }} </a>
      </li>
      <!-- <li :class="{'disabled': current == page}"><a href="javascript:;" @click="setCurrent(page)"> 尾页 </a></li> -->
      <li :class="{'disabled': current == page}"><a href="javascript:;" @click="setCurrent(current + 1)"> »</a></li>
    </ul>
  </div>
</template>

<script>
export default {
  data () {
    return {
      current: this.currentPage
    }
  },
  props: {
    total: {
      type: Number,
      default: 0
    },
    // 每页显示条数
    display: {  
      type: Number,
      default: 1
    },
    // 当前页
    currentPage: {
      type: Number,
      default: 1
    },
    // 分页条数
    pagegroup: {
      type: Number,
      default: 5,
      coerce: function(v) {
        v = v > 0 ? v : 5;
        return v % 2 === 1 ? v : v + 1;
      }
    }
  },
  computed: {
    page: function () { // 总页数
        return Math.ceil(this.total / this.display);
      },
      grouplist: function () { // 获取分页页码
        var len = this.page, temp = [], list = [], count = Math.floor(this.pagegroup / 2), center = this.current;
        if (len <= this.pagegroup) {
          while (len--) {
            temp.push({text: this.page - len, val: this.page - len});
          }
          ;
          return temp;
        }
        while (len--) {
          temp.push(this.page - len);
        }
        ;
        var idx = temp.indexOf(center);
        (idx < count) && ( center = center + count - idx);
        (this.current > this.page - count) && ( center = this.page - count);
        temp = temp.splice(center - count - 1, this.pagegroup);
        do {
          var t = temp.shift();
          list.push({
            text: t,
            val: t
          });
        } while (temp.length);
        if (this.page > this.pagegroup) {
          (this.current > count + 1) && list.unshift({text: '...', val: list[0].val - 1});
          (this.current < this.page - count) && list.push({text: '...', val: list[list.length - 1].val + 1});
        }
        return list;
      }
  },
  methods: {
    setCurrent: function (idx) {
      if (this.current != idx && idx > 0 && idx < this.page + 1) {
        this.current = idx;
        this.$emit('pagechange', this.current);
      }
    }
  }
}
</script>

<style scoped>
.pagination ul {
  overflow: hidden;
  display: flex;
  display: -webkit-flex;
  justify-content: center;
  align-items: center;
  margin: 0 auto;
  height: 70px;
}
.pagination li {
  height: 30px;
}
.pagination li a {
  display: block;
  width: auto;
  height: 30px;
  line-height: 30px;
  background-color: #fff;
  font-size: 29px;
  color: #5b5b5b;
  padding: 10px 20px;
  text-decoration: none;
  border-radius: 50px;
  margin: 0 6px;
}
.pagination li.active a {
  color: #9a4fe0;
}
</style>



